Reference voltage generator and voltage generating system having the same

Abstract

A reference voltage generator includes a constant voltage generator suitable for using a high voltage as a first power supply voltage and for generating a constant voltage, and a first reference voltage generating unit suitable for using the constant voltage as a second power supply voltage and for generating a first reference voltage.

1 - 6 . (canceled) 
     
     
         7 . A reference voltage generator, comprising:
 a constant current generator suitable for using a high voltage as a first power supply voltage and generating a constant current; and   a first reference voltage generating unit suitable for using the constant current as a power source and generating a first reference voltage.   
     
     
         8 . The reference voltage generator of  claim 7 , wherein the constant current generator comprises a second reference voltage generating unit suitable for using a high voltage as a power supply voltage and generating a first reference voltage; and a current mirror unit suitable for generating a constant current in response to the first reference voltage. 
     
     
         9 . The reference voltage generator of  claim 8 , the first reference voltage generating unit and the second reference voltage generating unit are threshold type reference voltage generators. 
     
     
         10 . The reference voltage generator of  claim 8 , wherein the high voltage is a high voltage for a word line of a memory chip. 
     
     
         11 - 16 . (canceled) 
     
     
         17 . A voltage generating system, comprising:
 a reference voltage generator comprising:   a constant current generator suitable for using a first high voltage as a power supply voltage and generating a constant current; and a first reference voltage generating unit suitable for using the constant current as a power source and generating a first reference voltage; and
 a boosting unit suitable for generating a second high voltage in response to the first reference voltage and the second high voltage. 
   
     
     
         18 . The voltage generating system of  claim 17 , wherein the first high voltage is substantially the same as the second high voltage. 
     
     
         19 . The voltage generating system of  claim 17 , wherein the first high voltage is supplied from an external device. 
     
     
         20 . The voltage generating system of  claim 19 , wherein the external device is a controller coupled to a memory device.